Disclosure to Promote the Right To Information

Transcription

1 इ टरन ट म नक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ज न1 क अ+धक र, ज 1 क अ+धक र Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live प0र 1 क छ ड न' 5 तरफ Jawaharlal Nehru Step Out From the Old to the New IS (1994): Respiratory protactive devices - breathing apparatus, Part 2: Open circuit breathing apparatus [CHD 8: Occupational Safety, Health and Chemical Hazards]! न $ एक न' भ रत क +नम-ण Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge! न एक ऐस खज न > ज कभ च0र य नहB ज सकत ह ह Bhartṛhari Nītiśatakam Knowledge is such a treasure which cannot be stolen

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4 IS10245( Part2):1994 WT 2 3W PTTFCLt?BW FViS ( qe?tt g;r+bjt ) Indian Standard RESPIRATORY PROTECTIVE DEVICES - SPECIFICATION PART 2 OPEN CIRCUIT BREATHING AP-PARATUS ( First Revision ) UDC BIS 1994 BUREAU OF INDIAN STANDARDS MANAK EHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI June 1994 Price Group 6

5 Industrial Safety Sectional Committee, CHD 008 FOREWORD This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Industrial Safety Sectional Committee had been approved by the Chemical Division Council. This standard was first published in As breathing apparatus is one of the most important life saving equipment the need was felt to standardize this equipment to ensure the quality of production. Accordingly, the standard on breathing apparatus was issued in four parts. Part 1 dealing with closed circuit breathing apparatus, Part 2 dealing with open circuit breathing apparatus, Part 3 dealing with fresh air hose and compressed air line and Part 4 dealing with escape breathing apparatus. In view of the recent technological development, the concerned committee decided to revise Part 2 of this standard and harmonize it with EN 137 : 1986 Respiratory protective devices: Self-contained open circuit compressed air breathing apparatus published by European Committee for Standardization. It is recommended that reference should be made to IS 9623 : 1980 Recommendation for the selection, use and maintenance of respiratory protective devices for guidance on the type of respiration protection that should be provided for particular conditions. In addition, care should be taken in the choice of breathing apparatus itself, where such equipment is to be nsed in very high ( 60 C f 3 C) or very low ( - 3O C&3 C ) ambient temperatures and the instructions provided by the suppliers should be carefully noted. Certain toxic substances which may occur in some atmospheres can be absorbed by the skin. Where these do occur, respiratory protection alone is not sufficient and the whole body should be protected. In this revision, for requirements for thread connections, mouthpiece and full facepiece, relevant Indian Standards have been referred to. The requirements for weight, frequency range of warning device, resistance to breathing, resistance to temperature and method of test for practical performance test have been modified in order to bring them in line with EN 137 : The composition of the committee Annex D. responsible for formulation of this standard is given at For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 Rules for rounding off numerical values ( revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

6 Indian Standard IS ( Part 2 ) : 1994 RESPIRATORY PROTECTIVE DEVICES - SPECIFICATI~ON PART 2 OPEN CIRCUIT BREATHING APPARATUS ( First Revision ) 1 SCOPE This standard prescribes requirements of design, construction, performance and lahoratory and practical tests for open circuit types of Breathing Apparatus. In these apparatus compressed air carried in cylinder/cylinders is fed either via pressure reducer and lung governed demand valve or lung governed demand valve connected to the facepiece to enable the wearer to breathe Exhaled air passes through the non-return valve to the atmosphere. 2 REFERENCES The following Indian Standards sary adjuncts to this standard: IS No : : : : : ( Part 3 ) : ( Part 1 ) : ( Part 2 ) : 1994 Title are the neces- Pressure and vacuum gauges ( second revision ) Colour identification of gas cylinders and related equipment intended for medical use Glossary of terms relating to respiratory protective devices Tyre pressure gauge for automobile ( pocket type ) Recommendation for the selection, use and maintenance of respiratory protective devices Breathing apparatus : Part 3 Fresh air hose and compressed air line breathing apparatus Respiratory protective devices: Threads for face-piece: Part 1 Standard thread connection - Specification Respiratory protective devices: Threads for face-piece; Part 2, Centre thread connection - Specification IS No : 1994 Title Respiratory protective devices: Full-face masks - Specification _: 1994 Respiratory protective devi-, ces: Mouthpiece assemblies - Specification 3 TERMINOLOGY 3.1 For the purpose ofthis standard the following definitions shall apply apart from those given in IS 8347 : Theoretical Duration/Nominal Working Duration A period of time in minutes arrived at by dividing the fully charged capacity of the cylinder in litre by 40 I/m ( that is, assuming an airflow of 40 l/m ). The reserve period is also included in the above calculation. NOTE - The air consumption varies depending on the nature of work, the users physical condition and experience of using a breathing apparatus as well as actual task to be performed. An internationally accepted method of calculating the theoretical duration is assumption of an average~consumption of 40 l/min Nominal Effective Duration Theoretical duration plus a reserve period of at least 10 minutes. NOTE - For marine use the storage capacity of the cylinder or cylinders attached to the apparatus and carried by the wearer shall be at least litres of free air Inhaled Air The air breathed in by the wearer. 3.X.4 Exhaled Air The air breathed out by the wearer. 1

7 IS ( Part 2 ) : TYPES Open circuit breathing apparatus are classified according to the effective air volume at a pressure of 1 bar absolute at a temperature of 20 C in the following types: a) Type litres Min b) Type litres Min c) Type litres Min d) Type litres Min e) Type litres Min 5 REQUIREMENTS 5.1 Design 51.1 Open-circuit compressed air breathing apparatus is designed and constructed to enable the wearer to breathe air on demand from a high pressure air cylinder ( or cylinders ) either via pressure reducer and a lung governed demand valve or a lung governed demand valve connected to the facepiece. The exhaled air passes without recirculation from the facepiece via the exhalation valve to the atmosphere The apparatus shall be sufficiently robust to withstand the rough usage it is likely to receive in service and designed so that it will continue to function satisfactorily_ while temporarily, accidentally submerged m water at a maximum depth of one metre and thereafter until the air in the cylinder is exhausted. The apparatus is not designed for prolonged use under water The apparatus shall be so designed that no parts or sharp edges~are likely to be caught on prdjections in narrow passages The apparatus shall be so designed that the wearer can remove it and while still wearing the facepiece, continue to breathe air from the apparatus The apparatus shall be designed to ensure its full function in any orientation The main valve( s ) of the air cylinder( s ) shall be arranged so, that the wearer canoperate them while wearing the apparatus The apparatus shall be so designed and constructed as to prevent ingress of the external atmosphere within the limit set out in this standard. 5.2 Materials/Components All the materials used in the construction shall -have adequate mechanical strength, durability and resistance to deterioration by heat Or by contact with sea water or mine water. Such materials shall be antistatic and fire resistant as far as practicable Exposed parts excluding cylinders, that is, those which may be subjected to impact during practical performance tests shall not be made of magnesium, titanium, aluminium or alloys containing such proportions of these metals which on impact, give rise to frictional sparks capable of igniting flammable gas mixtures. Any cylinder making use of such materials shall be protected so that when tested for impact and scraping, no metal shall be exposed Materials that may come into contact with the skin shall be non-staining, soft, pliable and shall not contain known dermatitic substances Connections ( Couplings ) The design and construction of the apparatus shall permit its component parts to be readily separated for cleaning, examination and testing. The couplings required to achieve this shall be readily connected and secured, where possible by hand. Any means for sealing used shall be retained in position when the joints and couplings are disconnected during normal maintenance Adjustable Parts All parts requiring manipulation by wearer shall be readily accessible and easily distinguishable from one another by touch. All adjustable parts and controls shall be so constructed that their adjustment is not liable to accidental alteration during use Air Line Connection If an air line is to be used with this type of apparatus, the apparatus shall be provided with a suitable, leak-tight non-return valve and connection and the apparatus shall satisfy the requirements given in IS ( Part 3 ) : Face Connector The connection between the facepiece and the apparatus may be achieved by a permanent or special type of connection or by a screw thread connection. If a screw thread connection is used then the conn~ection CAT for negative pressure apparatus according to IS ( Part 1 ) : 1994 or IS ( Part 2 ) : 1994 shall be used. If any other thread is used, it shall not be possible to connect it to the standard thread connection CA~or CAT of the documents mentioned above. The standard

8 IS ( Part 2 ) : 1994 thread CA or CAT shall not be used for apparatus with positive pressure Facepiece Only a full face mask or a mouthpiece conforming to IS : 1994 or IS : 1994 respectively shall be used Head Harness The head harness shall hold the facepiece firmly and comfortably in position. It shall be simply fitted and adjusted and shall be capable of ready cleaning and decontamination. Any fabric used in the construction of a head harness shall be resistant to shrinkage and shall not have known effect of any irritation to the skin of the wearer The head harness shall be adjustable and, if consisting only of straps, these shall be adjustable and not less than 19 mm ( nominal ) wide at the points in contact with the head, and designed so as to ensure that the wearer may readjust the straps before each occasion of use Body Harness The body harness shall be designed to allow the user to don the apparatus quickly and easily without assistance and shall be adjustable. Buckles fitted to waist and shoulder harness shall be so constructed that once adjusted they will not slip. Any fabric used in the construction of a body harness shall be resistant to shrinkage. Where the body harness incorporates means for attachment of a lifeline, the harness together with the snap hook shall be capable of withstanding a drop test of 1 m when loaded with 75 kg. The harness shall be constructed such that when tested for practical performance tests in accordance with the method prescribed in Annex A the apparatus shall be worn without avoidable discomfort and the wearer shall show no undue sign of strain attributable to wearing the apparatus and the apparatus shall impede the wearer as little as possible when in crouched position or when sitting in a confined space Flexible Hoses and Tubes The hose may be extensible and compressable. Any flexible hose or tube connected to the facepiece shall permit free head movement and shall not restrict or close off the air supply under chin or arm pressure during practical performance test carried out in accordance with the method prescribed in Annex A. The hose shall not collapse and temporary elongation shall be not less than 20 percent and the deformation of the hose shall be not more than 10 percent when tested in accordance with the method prescribed in and High pressure tubes and couplipgs shall be capable of withstanding a test pressure of twice the maximum designed working pressure. It shall not be possible to fit a low pressure tube or hose into a higher pressure part of the circuit Tubes for the demand valve ( connections included ) shall withstand for at least 15 min twice the operating pressure of pressure reducer safety valve or at least 30 bar whichever is higher For testing the ductility of a corrugated hose it shall be suspended. Its length ( without couplings ) shall be measured ( a ). Afterwards a force of 10 N shall be applied to the hose for a period of 5 minutes and the length is measured ( b ). The elongation ( b-a ) is calculated in percent For testing the permanent axial linear deformation of the corrugated hose it is submitted immediately after the ductility test to a force of 10 N for 48 hours. After a recovery period of 6 hours the length of the hose is measured again ( c ). The permanent dsformation ( c - a ) is calculated in percent. This test shall be repeated after a further 7 days. 5.2J2 Lung Governed Demand Valve Breathable air supply The breathable air supply shall be at a flow rate of at least 300 l/min at all cylinder pressures above 20 bar and of at least 150 l/min at a cylinder pressure of 10 bar Without positive pressure The negative pressure of the lung governed supply demand valve shall be between 0.5 mbar and 3.5 mbar when tested using a continuous flow of 10 l/min from maximum filling pressure down to 10 bar. A self-opening demand valve at negative pressure of less than 0.5 mbar shall not occur. At a flow rate of 300 l/min the resistance shall not exceed 10 mbar at all pressures down to 20 bar. The cylinder pressure and the negative pressures shall be measured by precision gauges. The air flow shall be measured by flowmeter. Air flow shall be induced by a suitable device With positive pressure This apparatus shall maintain a positive pressure in the cavity of the mask adjacent to the face seal up to a flow of 300 l/min at all cylinder pressure above 20 bar. 3

9 1s (Part 2 ): Supplementary supply The apparatus without positive pressure shall be provided with a manually operated means of providing a supply of air at a flow of between 60 l/min and 300 l/min at all cylinder pressures above 50 bar independently of the normal operation of the demand valve. Apparatus with positive pressure may be provided with such a device Pressure Gauge The apparatus shall be equipped with a reliable pressure indicator which will record the pressure in the cylinder on opening the valve or valves to ensure that the individual or the equalised contents are measured respectively. It should be so placed as to enable the wearer to read gas ~cyliuder pressure conveniently The pressure gauge should~have a blowout release. The blow-out release should be so located that in the event of an explosion the fracture of the pressure element of the gauge, the blast will be away from the front. The gauge window shall be made of a material of non-splintering glass or of clear plastic material. The sliding indicator pin shall be secured against accidental blow out When pressure gauge and connection hose are removed from the apparatus, flow shall not exceed 25 l/min at full cylinder pressure The pressure gauge shall be sufficiently robust to withstand rough usage. When the tube is protected by sheathing the enclosed space shall be vented to atmosphere. The pressure gauge shall be resistant to dust and water and shall withstand immersion in water at a depth of one metre for 24 hours. After the test no water shall be visible in the device. The pressure gauge shall be graduated from the zero mark up to the value of at least 50 bar above the maximum falling pressure of the cylinder. Table 1 shall apply regarding the accuracy when reading at decreasing pressure when compared with control manometer. Table 1 Accuracy of Pressure Gauge Reading at Decreasing Pressure Sl No. (1) ii ii) ) iv) Pressure Gauge Reading (2) 40 bar 100 bar 200 bar 300 bar Accuracy (3) -+ 0 bar - 5 bar f 10 bar f 10 bar f 10 bar The maximum diameter of the case shall not exceed 63 mm. The design of the gauge shall allow the recording of the indicated pressure with 10 bar The pressure gauge ( see IS 3624 : 1966 and IS 8457 : 1977 ) shall withstand pressure greater than the maximum cylinder pressure so that it will operate continuously and accurately without overstrain. The pressure gauge for use with such apparatus shall be shockresistant Warning Device The apparatus shall have a suitable warning device that operates when the cylinder pressure drops to a predetermined level to warn the wearer. The warning device shall respond at the latest when only one-fifth of the total breathing air volume is left ( tolerance ) but at least 200 I are still available. After response of the warning device, the wearer shall be able to continue to breathe with dificulty. The functioning of the warning device shall be tested using a breathing machine adjusted to 20 strokes/min and 1.5 l/stroke. If there is an audible warning device the acoustic pressure level shall be a minimum of 90 db ( A ) as a continuous or intermittent warning at the wearers ears. The frequency range shall be between Hz and Hz. The air loss that might be caused by the warning signal shall not exceed an average of 5 l/min from response of signal to a pressure of 10 bar or not more than 50 1 for those warning devices not operating continuously. The duration of the warning at 90 db ( A ) shall be at least 15 set for a continuous signal and 60 set for an intermittent signal Testing of warning device The functioning of the warning device shall be tested using a breathing machine adjusted to 20 strokes/min and 1.5 l/stroke Cylinder and Main Valve( s ) The air cylinder shall comply with appropriate national regulations. The cylinder shall be approved with respect to the appropriate filling pressure The design of the cylinder valve shall be such as to ensure safe performance. The valve shall be so designed that the valve spindle cannot be completely unscrewed from the assembly during normal operation of the valve. The valve shall be designed so that it cannot be closed inadvertantly by contact with a surface by one of the following methods: 4

10 IS ( Part 2 ) : 1994 a> The valve shall be designed so that a minimum two turns of the handwheel are required to open fully the valve. b) The valve shall be lockable in open position. c> Apparatus fitted with more than 2 cylinders may be fitted with individual valve in the cylinder Cylinder valve connection ( valve outlet ) It shall not be possible to connect apparatus with a higher maximum filling pressure ( e.g. 300 bar ) to an apparatus which is designed only for a-lower maximum filling pressure ( e.g. 200 bar ) Pressure Reducer Any adjustable medium pressure stage shall be reliably secured against accidental alteration and adequate~ly sealed so that any unauthorized adjustment can be detected. A pressure reducer safety valve shall be provided, if the apparatus cannot take the full cylinder pressure. If a pressure reducer safety valve is incorporated, it shall be designed to operate within the manufacturers design parameters. At maximum operating pressure of the pressure reducer safety valve the apparatus still has to permit breathing. The maximum pressure built up at the inlet of the lung governed demand valve shall be such that the wearer can continue breathing. Where demand valves open with medium pressure a pressure reducer safety valve need not be installed, provided the previous requirements are met. For testing the performance of the pressure reducer safety valve, the highest leakage which may occur during simulated malfunction of the pressure reducer is used ( broken lever, broken spring, etc). The test shall be carried out at the highest approved filling pressure of the compressed air cylinder High Pressure Parts Metallic high pressure tubes, valves and coupling shall be capable of withstanding a test pressure twice the maximum filling pressure or 50 percent ofthe maximum filling pressure. Nonmetallic parts shall be capable of withstanding a test pressure twice the maximum filling pressure of the cylinder High and Low Pressure Connection It shall not be possible to fit a low pressure tube or hose directly to a high pressure part of the circuit. 5.3 Weight The weight of the apparatus as ready for use with facepiece and fully charged cylinder shall not exceed 18 kg. The cylinder used for compressed air shall have the approval of Chief Controller of Explosives, Nagpur. Colour of the cylinder shall be in accordance with IS 3933 : Condition of the Inhaled Air Carbon Dioxide Content When tested in accordance with Annex B the carbon dioxide content of the inhaled air ( including dead space effects ) shall not exceed 1.5 percent ( by volume ) during the nominal effective duration of the apparatus. 5.5 Cleaning and Decontamination The design of the apparatus shall be such as to facilitate cleaning. The material shall withstand cleaning and decontamination agents recommended by manufacturer. The process shall be approved by testing authority. Testing is by visual inspection made by responsible testing authority. 5.6 Resistance to Breathing Breathing resistance of the apparatus and its connections shall be determined using a breathing machine with a sinusoidal characteristic adjusted to 25 strokeslmin and 2 l/strokes. A precision gauge shall be used. If necessary, the breathing resistance of the tubing and dummy head shall be subtracted from the measured value to determine the breathing resistance of the apparatus. During the measurement the apparatus has to be in normal wearing position, fnhalation Resistance Without positive pressure The inhalation resistance of an apparatus without facepiece shall not exceed 4.5 mbar at all cylinder pressures from full to IO bar. Where a lung governed demand valve is permanently attached to a full face mask the negative pressure shall not exceed 7 mbar With positive pressure The apparatus has to be designed in such a way that at a flow rate of 300 l/min a positive pressure is maintained in a cavity of the mask adjacent to the face seal. The requirement shall be valid at all cylinder pressures above 20 bar Exhalation Resistance Without positive pressure The exhalation resistance of an apparatus with facepiece shall not exceed 3.0 mbar.

11 Is ( Part 2 ) : With positive pressure The exhalation valve shall have an opening resistance not exceeding 6 mbar, a resistance not exceeding 7 mbar at a continuous flow of 160 l/min and a resistance not exceeding 10 mbar at a continuous flow of 300 l/min. The static pressure in the mask cavity ( inner mask if applicable ) under conditions of equilibrium shall not exceed 5 mbar. 5.7 Comfort When tested in accordance with Annex A, the apparatus shall be such that it is worn with avoidable discomfort, that the wearers show no undue sign of strain attributable to wearing the apparatus, and that it impedes the wearers as little as possible when in a crouched position nor when working in a confined space. 5.8 Resistance to Temperature Storage Trouble free operation shall be ensured after storage at temperatures varying from - 30 C to + 60 C when tested in accordance with Annex C. Apparatus specially designed for temperatures beyond these limits shall be tested and marked accordingly Performnnce The apparatus shall operate trouble-free over the temperature range - 30 C to + 60 C when tested in accordance with Annex C. Apparatus specially designed for temperatures beyond these limits shah be tested and marked accordingly. The supplier shall also provide clear instruction along with the apparatus for such purpose. 5.9 Protection Against Particulate Matter The component parts of the apparatus supplying compressed air shall be reliably protected against the penetration of particulate matter that may be contained in the compressed air Practical Performance Test In addition to the machine tests described above, the apparatus shall also undergo practical performance tests under realistic conditions. The general practical performance tests as described in Annex A serves _. the _ purpose of checking the apparatus for rmperfections that cannot be determined by any other tests. Practical performance tests shall be performed with at least two apparatus and four subjects. 6 INSTRUCTIONS 6.1 Breathing apparatus manufactured in compliance with this standard shall be accompanied by operating instructions for maintenance and use which shall include where appropriate: a> b) nominal working duration; guidance on fit of facepiece, and adjustment of face sea1 where relevant; C> a warning that adequate protection may not be provided by the apparatus in certa.in highly toxic atmospheres and that guidance should be sought from IS 9623 : 1980 for the selection, use and maintenance of respiratory protective devices; d) a warning, that, allowance should be made for the fact that it is likely that faceseal fit will not be suitable for persons wearing spectacles or having sideburns or beards; and e) a warning that at very high work rates, the pressure in the facepiece of positive pressure breathing apparatus may become negative at peak inhalations. 7 MARKING 7.1 Breathing apparatus manufactured in compliance with this standard shall be marked with the following particulars. 7.2 Marking on the Facepiece a) Name, trade-mark or other means of identification of the manufacturer; b) Size ( if more than one size is available ); and c) Year and month of manufacture. 7.3 Marking on the Apparatus a) Name, trade-mark or mother means of identifying the manufacturer; b) Year and month of manufacture shall be marked legibly on breathing tubes, mouth niece. faceniece and diauhraam. 6

12 A-l TEST SUBJECTS ANNEX A-l.1 Breathing apparatus is tested by test subjects who practise regularly with breathing apparatus and whose medical history is known to be satisfactory. They shall be medically examined immediately before the tests and certified fit to undertake the test procedure. Bach subject is suitably clothed. A-2 MEDICAL SUPERVISJON The tests shall be carried out under the supervision of a registered medical practitioner. A-3 PREPARATION OF APPARATUS TO BE TESTED The high pressure cylinder is purged with air before being fully charged to the prescribed pressure. The apparatus is assembled, the resistance to breathing is measured and the apparatus is tested for leak tightness. The cylinder pressure at the start of the test should correspond to the prescribed filling pressure. A-4 TEST PROCEDURE All tests shall be carried out at normal room temperature and test pressure and humidity shall be recorded. A-4.1 Test Conditions ( Clauses , , 5.7 and 5.10 ) PRACTICAL PERFORMANCE TEST All tests shall be carried out at room temperature and the test temperature and humidity shall be recorded. During the test the apparatus will be subjectively assessed by the wearer and the wearers comments on the following points shall be recorded after the test: 4 Harness comfort; b) Security of fastenings c) and couplings; Accessibility of controls and pressure gauge ; 4 Clarity of vision on the visor of the facemask; e) Supplementary supply ( if fitted ); f) Speech transmission; g) Audible warning device; and h) Any other comments reported by the wearer on request. A f> IS ( Part 2 ) : 1994 ( walking test ) and the one in which two different subjects work in -practical conditions (, work simulation test ). Each test is continuous, without removal of the apparatus, for a period equal to the working duration of the apparatus or 30 minutes whichever is less. NOTE- If the audible warning device has not operated during the 30 minute test period, the cylinder pressure shall be reduced manually to the audible warning pressure range, to check the effectiveness of the latter, which shall comply with the requirements o-f A-4.3 Work Simulation Test The apparatus is tested under condition which can be expected during normal use. During this test the following activities shall be done in simulation of the practical use of the apparatus. The test shall Abe completed within a total working time of 30 min. The sequence of activities is at the discretion of the test authority. The individual activities shall be arranged so that sufficient time is left for the measurements prescribed: a) 30 pulls on a work machine, each pull being vertical from I.8 m towards the ground on a mass of 25 kg, giving a total work load of N m. Crawling through a narrow section ( 4-m long ) which is so low that the test subject has to doff the apparatus and push it in front of him or pull it behind him while still breathing from the apparatus. f3) Laying out of a fire hose of at least 15 m in length and recoiling the same. A-4.2 Two kinds of tests are made, one in This test shall be continuous, without removal which two subjects wearing the apparatus walk of the apparatus, for an initial period of at a regular rate of 6 km/h on a level course approximately 15 min after which the subject b) C> Walking on the level with headroom of 1.1 m to 1.5 m ( total distance 200 m ). d) Crawling on the level with headroom of less than 0.75 m ( total distance 100 m ). 4 Walking on the level with full headroom ( total distance 125 m ). Climbing up and down a ladder, passing once, in each direction through 460 mm square opening ( total vertical distance 20 m ). 7

13 IS ( Part 2 ) : 1994 shall have a rest period of 5 min during which The second section of the test of the apparatus he can be medically assessed and allow time shall then continue to give a complete working for the compressed air cylinder to be charged of 30 min. If the exercises have been completed if the testing officer considers that there may within a shorter period the remaining time is be insufficient air to complete the test. taken up with the subject walking at 6 km/h. B-l TEST EQUIPMENT B-l.1 A lung simulator machine designed to provide sinusoidal air flow. B-2 TEST PROCEDURE ANNEX B ( Clause ) LABORATORY PERFORMANCE TEST B-2.1 The facepiece of the apparatus is connected in an an-tight manner to the breathing machine exhales through the facepiece a 5 percent ( by volume ) carbon dioxide/air mixture at ambient temperature and inhales through the facepiece of the apparatus. Tests are conducted at: a) a tidal volume of 2.0 litres of air with 20 respirations per minute ( total inhalation 40 l/min ); and b) a tidal volume of 2.5 litres of air with 32 respirations per minute ( total inhalation 80 l/min ). In a separate test, the sinusoidal air flow is increased to 100 I/min for a period sufficient for an assessment to be made of the functioning of the apparatus at this flow. B-2.2 Test at Low Temperature The apparatus, including the compressed air cylinder( s ) and an approved facepiece is cooled in ambient temperature of ( 30 f 3 C ) for 4 hours. Subsequently, the apparatus is connected to a breathing machine placed outside the cooling system. The breathing machine is then operated at a minute volume of 50 litres ( 25 strokeslmin and 2 litres/stroke ) until the compressed air supply is exhausted (20 bar ). The test shall be repeated with the same cooled apparatus, after having replaced the empty cylinders by fully charged cylinders previously stored at room temperature. During this test, the inhalation resistance shall not exceed 10 m bar. For breathing apparatus with positive pressure, a positive pressure has to be maintained in the cavity of the mask adjacent to the face seal. The exhalation resistance of all types of apparatus shall not exceed 10 m bar. B-2.3 Test at High Temperature The apparatus including air cylinder and facepiece is stored in a chamber at a temperature of 60 & 3 C and at a relatively humidity of 50 percent for 4 hours. The apparatus is tested using a breathing air machine. Subsequently, the apparatus is tested using a breathing machine at a minute volume of 50 litres ( 25 strokes/min, 2 litres/stroke ) until the compreased air supply is exhausted ( 20 bar ). During this test, the inhalation resistance shall not exceed 7 mbar. For breathing apparatus with positive pressure, a positive pressure has to ne maintained in the cavity of the mask adjacent to the face seal. The exhalation resistance of an apparatus without positive pressure shall not exceed 3 mbar. The exhalation resistance ot an apparatus with positive pressure shall not exceed 7 mbar.

14 C-I RESISTANCE ANNEX C ( Clause ) METHOD OF TEST FOR RESISTANCE: TO TEMPERATURE TO TEMPE-RATURE C-l.1 Laboratory Tests with Machine C-l.2 Tests at Low Temperature a Breathing The apparatus, including the compressed air cylinder( s ) and an approved facepiece shall be according to IS : 1994 and IS : 1994, and is cooled in an ambient temperature of ( - 30 & 3 ) C for 4 hours. Subsequently, the apparatus is connected to a breathing machine placed outside the cooling system. The breathing machine is then operated at a minute volume of 50 litres ( 25 strokes/min, 2 litreslstroke ) until the compressed air supply is exhausted ( 20 bar ). The test shall be repeated with the same cooled apparatus, after having replaced the empty cylinders by fully charged cylinders previously stored at room tempsrature. During this test, the inhalation resistance shall not exceed 10 mbar. For breathing apparatus with positive pressure, a positive prmessure has to be maintained in the cavity of the mask adjacent to the face seal. The exhalation resistance of all types of apparatus shall not exceed 10 mbar. C-l.3 Tests at High Temperature The apparatus including compressed air cylinder( s ) ( filling pressure: 100 bar ) and an approved facepiece conforming to IS : 1994, is stored in a chamber at a temperature of ( 60 f 3 ) C and a relative humidity of not more than 50 percent for 4 hours. Subsequently, the apparatus his tested using a breathing machine at a minute volume of 50 litres ( 25 strokeslmin, 2 litres/stroke ) until the compressed air supply is exhausted ( 20 bar ). During this test, the inhalation resistance shall not exceed 7 mbar. For breathing apparatus with positive pressure, a positive pressure has to be maintained in the cavity of the mask adjacent to the face seal. IS ( Part 2 ) : 1994 The exhalation resistance of an apparatus without positive pressure shall not exceed 3 mbar. The exhalation resistance of an apparatus with positive pressure shall not exceed 7 mbar. C-l.4 Practical Performance Tests at Different Temperatures C Tests at Low Temperature C Preparation of Apparatus to be Tested Two sets of apparatus, as ready for use, are pre-cooled at a temperature of ( - 30 f 3) C for a period of 4 hours. C Test Procedure Two warmly clothed subjects don the pre-cooled apparatus in a cold chamber and perform work in an ambient temperature of ( - 15 f 3 ) C. The test is continuous without removal of the apparatus over a period of 30 minutes or at least until the warning device starts to operate. The work shall be equally devided between: a) walking and crawling slowly; b) carrying and building with wooden clocks or similar. At the end of the test, the resistance to breathing is measured to determine whether there is any obstruction, and the apparatus is examined for malfunction due to the low temperature. C Tests with Apparatus at Room Temperature C Preparation of Apparatus to be Tested Two sets of apparatus are prepared ready for use and stored at room temperature ( 23 f 2) C for at least 4 hours. C Test Procedure Two warmly clothed subjects don the apparatus at room temperature ( about 23 C ) and enter a cold chamber of at least ( - 6 f 2 ) C. The same test programme to that described in C is carried out for a period of 30 minutes or at least until the warning device starts to operate, whichever is earlier

15 IS ( Part 2 ) 1994 Chairman!&RI K. C. GUPTA Member SHRI PREM BAWEJA SHRI B. VI~AY KUMAR ( Alternate ) SHRI BHAGWATI PRASAD &RI SATISH CHANDER ( Alternate ) DR S. C. CHAWLA SHRI M. K. BANERJEE ( Akernate ) 231.1~1 P. K. CHATTERJPE &RI H. S. KAPHAWAN ( Alternate ) DIRECTOR ( MINES SAFETY ) SHRI A. K. RUDRA ( Ahnate ) SHRI H. S. GAHLAUT SHRI B. R. MEHTA ( Ahernate ) SHRI V. K. GOEL SHRI M. L. AHUJA ( Alternate ) SHRI S. P. GOENKA SHRI N. DUTTA ( Alterme ) SHRI M. KANT SHRI KIRIT MARU ( Aftmate ) DR J. MAHAPATRA SHRI M. K. MALHOTRA &RI H. N. MIRASHI DR H- MUKHERJEE &RI C. M. SHARMA (Alternate ) SHRI R. N. MUKHERJEE SHRI A. BANARIEE ( Alternate ) &RI S. K. MUKHERJI SHRI A. K. GHOSH ( Alternate ) SHRI P. S. PRUTHI SHRI SURESH KAPOOR ( Ahmate ) SHRI P. RAJENDRAN SHRI H. S. RAWAT ( Mernate ) SHRI A. RAMAMURTHY SHRI K. RAVICHANDRA SHR~ M. SHRIVASTVA ( Alternate ) SHRI A. J. REGO SHRI A. K. CHATTERJEE (Alternate ) SHRI M. R. SAMPATH SHRI 0. N. DAGA ( Alternate ) SHRI SURENDRA KUMAR SHRI R. PARTHASARTHY ( Altermte ) REPRESENTATIVE REPRESENTATIW REPRESENTATIVE REPRESENTATIVE DR R. K. SINGH, Director ( Chem ) ANNEX D ( Foreword ) COMMITTEE COMPOSITION Industrial Safety Sectional Committee, CHD 008 Respresenting National Safety Council, Bombay Hindustan Aeronautics Limited, Bangalore Employees State Insurance Corporation, Calcutta Directorate General of Technical Development, New Delhi Defence Institute Fire Research, New Delhi Directorate General of Mines Safety, Dhanbad Institute of Fire Engineers ( India ), New Delhi Central Boiler Board, New Delhi Mining, Geological and Metallurgical Institute of India, Calcutta Safety Appliances Manufacturers Association, Calcutta Standing Committee on Safety for Steel Industries, Ran&i Directorate General Factory Advice -Services and Labour Institute, Bombay Factory Inspectorate, Government of Maharashtra, Bombay Chief Controller of Explosives, Nagpur Central Mining Research Station, Dhanbad Standing Fire Advisory Council, New Delhi Indian Pesticide Association. New Delhi Directorate General Civil Avition ( National Airport Authority ), New Delhi Bhabha Atomic Research Centre, Bombay Ministry of Petroleum and Natural Gas ( Oil Industries Safety Directorate J, New Delhi National Safety Council, Bombay Indian Cotton Mills Federation, Bombay Indian Chemical Manufacturers Association, Calcutta Central Leather Research Tnstitute, Madras Confederation of Indian Industries, New Delhi lndian Space Research Organization, Governement of.lndia (Department of Space ), Andhra Pradesh National Institute of Occupational Health, Ahmedabad Director General, BIS ( Ex-officio Member ) Member Secretary SHRI P. MUKHOPADHYAY Joint Director ( C hem ), BIS ( Continued on page 11 ) 10

16 IS ( Part 2 ) : 1994 ( Continued from page 10 ) Personal Protective Equipment ( Respiratory ) Subcommittee, CHD 008 : 01 Convener SHRI R. N. MUKHERJEE Members DR S. CHATTOPADHYAY SHRI K. K. DUTT ( Alternate ) SHRI S. K. DANGWAL SHRI M. H. FULEKAR ( Alternate ) SHRI A. N. INDURKAR SHRI PRATAP NAIR (Alternate ) SHRI S. K. MUKHERJEE SHRI B. R. MEHTA ( Alternate ) SHRI C. PERREIRA SHRI DON RISHBERT ( Alternate ) SHRI S. SANYAL SHRI J. N. SHARMA REPRESENTATIVE Representing Central Mining Research Station, Dhanbad Ministry of Defence ( DGQA ), New Delhi Central Labour Institute, Bombay Mines Safety Appliances, Calcutta Institute of Fire Engineers, New Delhi Joseph Leslie Drager Manufacturing, Bombay Coal India Ltd, Calcutta Indian Petrochemicals Limited, Vadodara Directorate General of Mines Safety, Dhanbad 11

17 Bnrero 01 Indian Standard8 BIS is a statutory institution established under the Bureau of Indian Standard3 Act, 1986 to promote harmonious development of the activities of stadardization, marking and quality certification of goods and attending to connected matters in the country. Copyright BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does~not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sixes, type or grade designations. Enquiries relating to copyright be addressed to the Director ( Publications ), BIS. Esririoo of Indian Standards Amendments are issued to standards as the need arises on the basis of comments. Standards art also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no chauges are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of BIS Handbook and Standards Monthly Additions. This Indian Standard has been developed from Dot : No. CHD 008 ( 0081 ). Amendments Issued Since Publication Amend No. Date of Issue Text AEccted Headquarters: BUREAU OF INDIAN STANDARDS Manak Bhavan, 9 Bahaduc Shah Zafar Marg, New Delhi Telephones : , Telegrams : Manaksanstha ( Common to all Officer ) Regional OlIlccr : Central : Msnak Bhavan, 9 Bdha&rr Shah Zdfar Marg NEW DELHI Eastern : l/14 C. t. T. Scheme VII M, V. I. P. Road, Maniktola CALCUTTA Northern : SC , Sector 35-C, CHANDIGARH Southern t C. I. T. Campus, IV Cross Road, M.4DRAS Telephone 331 o-1 31 { C , , , , 235~ , Western : Manakalaya, E9 MIDC, Marol, Andheri ( East ) [ , BOMBAY , Brdnch : AHMADABAD. BANGALORE. BHOPAL. BHUBANESHWAR. COIMBATORE. FARIDABAD. GHAZIABAD. GUWAHATI. HYDERABAD. JAIPUR. KANPUR LUCKNoW. PATNA. THIRUVANANTHAPURAM. Printed at Printwell Printers. Aligarh. India

18 AMENDMENT NO. 1 DECEMBER 2002 TO IS 10245( Part 2 ) :1994 RESPIRATORY PROTECTIVE DEVICES SPECIFICATION PART 2 OPEN CIRCUIT BREATHING APPARATUS ( First Reviswn ) ( Page 8, clause B-2.2,&st sentence ) Substitute the following for the existing: The appara~us, including the compressed air cylinder(s) and an approved facepiece is cooled in ambient temperature of -30 * 3 C for 4 hours. (CHD8) Reprography Unit, BIS, New Delhi, Indh

19 AMENDMENT NO. 2 DECEMBER 2006 TO IS (Part 2) :1994 RESPIRATORY PROTECTIVE DEVICES SPECIFICATION PART 2 OPEN CIRCUIT BREATHING APPARATUS (First Revision) (Page 9, clause C-1.2) Substitute facepiwe shall be according to IS 14170: 1994 or IS 14166: 1994 for facepiece shall be according to IS 14170:1994 and IS 14166:1994. (Page 9, clause C-1.4.3, line 9) Substitute blocks for clocks. (CHD 8) Reprography Unit, BIS, New Delhi, India